<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
  <style>
    table {
      width: 500px;
      height: 500px;
      border: 1px solid skyblue;
      border-collapse: collapse; /*合并相邻边框线*/
    }
    td {
      border: 1px solid skyblue;
    }
  </style>
</head>
<body>
<table cellpadding="0" cellspacing="0">
  <tr>
    <td>123</td>
    <td>123</td>
    <td>123</td>
    <td>123</td>
  </tr>
  <tr>
    <td>123</td>
    <td>123</td>
    <td>123</td>
    <td>123</td>
  </tr>
  <tr>
    <td>123</td>
    <td>123</td>
    <td>123</td>
    <td>123</td>
  </tr>
  <tr>
    <td>123</td>
    <td>123</td>
    <td>123</td>
    <td>123</td>
  </tr>
</table>
</body>
</html>
